“Metal to metal” is the term used to describe brake pads or shoes that have worn through all of their friction material. This happens when the metal backing of the pad or shoe rubs on the rotor or drum, which is also made of metal. This is not only dangerous but can require expensive repair if not taken care of in a timely fashion. Here are a few things to watch for, and how you can prevent them:
Signs and Symptoms
Usually when brakes go “metal to metal,” you’ll hear it first. There will be a noticeable, low-pitched grinding sound when braking, often accompanied by vibration. This tends to be especially prevalent at lower speeds and long, slow stops. You may also notice that your stopping distance increases, you have less control when turning, or you have to apply an immense amount of pressure on the brake pedal to bring the car to a complete stop.
Continuing to drive once brakes go metal to metal will not only worsen these symptoms but quickly increase your repair bill. If you wait until the pad has been worn to the anti-squeal shim, you’re going to be looking at a very expensive fix- anywhere from a few hundred to a few thousand of dollars, depending on what you drive and if any peripheral parts were damaged.
When the friction material has worn out, both the pad backing and the rotor will wear away very quickly. Rotors will eventually wear below the minimum thickness even if the pads do not go metal to metal. However, letting the pads wear beyond minimum thickness will quicken the need for rotor replacement. Rotors that could have been machinable before the brakes went metal to metal may need to be replaced.
Brake calipers are another component that can be destroyed if you continue to drive on bad brakes. Once a pad is ejected or worn too thin, the caliper piston can hyper-extend and come out of place, causing brake fluid to leak. If this happens, the calipers must be replaced. The calipers are not normally replaced during a brake job, so this is an extra expense that could have been avoided.
Our expert mechanics use latest diagnostic equipment, and high-quality CARQUEST auto parts, to get your brakes back in shape. Plus, our auto repair services are backed by an industry-leading 3 year / 36,000 mile warranty on parts and labor. Call us today at (413) 314-2280 or schedule an appointment online.